Woodwaste processing system with contaminate separation

ABSTRACT

A system for processing wastewood. The system may be mounted on a towable chassis. The wastewood is received at one end of the system and metal contaminants are removed from the wastewood. The wastewood is then separated according to size wherein a first size of wastewood is further processed by the system and a second size is removed from the system for subsequent re-processing. Unwanted paper and plastic contaminants are removed from the wastewood, and the wastewood of the first size is subjected to a further separating step wherein it is again separated according to size into usable end products.

BACKGROUND OF THE INVENTION

The present invention relates generally to systems for recyclingwoodwaste, and more particularly, to an apparatus and method forseparating contaminates from woodwaste to produce wood fuels and otherusable products.

The forest products industry has been converting sawmill waste into asource of fuel for over a hundred years. According to currentinformation, 80 percent of the total biomass residue converted to energyis derived from processing forest waste. Until recently, the term"biomass" referred to waste products of forest, agricultural, dairy, andanimal products industries. With increased tipping fees at wastedisposal sites (landfills) and a shortage of such sites in urban areas,there is an ever-increasing incentive to separate woodwaste from theurban waste stream, and to recycle it into a biomass boiler fuel andother usable products.

Based on recent data, 20 to 25 percent of all solid waste disposed of inurban areas is wood, or woody and fibrous organic material. Thismaterial is from discarded pallets, wood cratings, tree limbs, stumps,demolition waste, construction projects, and manufacturing industries.The vast majority of this material is transported to landfills forburial, adding to the nation's solid waste disposal crisis.

Burying woodwaste in landfills is not only a waste of a potential fuel,but is becoming an unmanageable problem in terms of finding adequatespace for such landfills. It is difficult to document the amount ofwoodwaste being landfilled nationwide. However, in metropolitan New Yorkalone, it is believed that about 10,000 tons per day are beinglandfilled. In addition to finding suitable landfill areas, landfillingis expensive, costing between $25.00 and $125.00 per ton. Theenvironmental impact of landfilling is also just now being confrontedthrough federal clean up and monitoring programs like the EPA Superfund.The simplest way to lessen the environmental impact is to decrease theamount of woodwaste going into landfills.

Of course, not all urban woodwaste can be economically separated fromthe waste stream, and some wood materials should not be utilized asfuel, as they may be contaminated with creosote, asbestos and/orformaldehyde. Even with these factors considered, recycling only 25percent of the woodwaste that New York generates daily would provide2,500 tons per day of biomass wood fuel. Providing a cost-effective wayof separating this biomass fuel source from the waste stream shouldencourage the recycling of more woodwaste, decreasing the amountdeposited in landfills and decreasing energy costs. The technology toutilize woodwaste as a fuel is existing and fully commercialized in manyareas. Plants such as Gaylord Container Company of Antioch, Calif. havebeen supplementing their woodwaste fuel with recycled urban woodwastesince the early 1980's, producing steam and 28 megawatts of electricity.At the present, in California alone, for example, there are at least 17different facilities generating 205 megawatts of electricity utilizing asmall percentage of recycled urban woodwaste as fuel.

Various equipment is currently on the market for processing wood andyard waste debris. For example, one such piece of equipment, sold by theassignee of the present invention, and known as the W.H.O Wood Waste TubGrinder, can process wood and yardwaste six feet long and up to twelveinches in diameter at a rate of 10 to 25 tons per hour. Privatecompanies and municipal public work departments utilizes these grindersto recycle woodwaste and yardwaste into boiler fuel, landscapingproducts, soil amendments, and bulking agents.

However, there is a real need in the marketplace for equipment suited toscreen and size woodwaste into a cleaner fuel. When marginal truckloadsof wood fuel are turned away because the fuel does not meet the boilerplant's specifications, or a wood fuel supplier is restricted fromprocessing available wood because of its dirt, metal, plastic, and/oryard waste content, the supplier's operating costs go up. Those costsmust be covered, which, in turn, makes urban woodwaste less attractiveas a fuel source. Additionally, higher operating costs limit others fromentering the field. Contaminated (marginal) woodwaste can be processedonly if the contaminates can be efficiently and economically removed. Ifthe contaminants are removed, the processed product that is unsuitablefor fuel may still be marketable as landscaping products.

Woodfueled biomass, electrical-generation facilities can burn fuel fromin-forest residues, forest industry woodwaste and urban woodwaste. Ofthe three wood fuels, urban woodwaste rates the highest in BTU value andlowest in moisture content. Therefore, it burns at a higher efficiencythan the other types of woodwastes. For instance, recycled urbanwastewood has an energy content of 8,000 to 9,000 BTUs per pound and amoisture content of 10-15 percent (wet basis). Harvested wood chips(in-forest residues) are rated at 6,000 BTUs per pound with a moisturecontent of about 35 to 45 percent (wet basis), and forest industrywastewood is rated about 7,500 BTUs per pound with a moisture content ofbetween about 10 and 30 percent (wet basis). Thus, wastewood from theurban stream has a 30 percent higher energy content than in-forestresidues and a 15 percent higher energy content than forest industrywaste. As such, the use of urban woodwaste can provide increasedefficiencies in electrical energy generation plants burning suchmaterials.

At present, it is thought that of the wood fuel types burned in boilersonly about 3 percent is produced from urban woodwaste. If more of thehigher BTU, urban woodwaste could meet wood fuel specifications, thenthe operating efficiencies and cost-effectiveness of these plants wouldimprove. Thus, recycled urban woodwaste is the most valuable of any woodfuel product when it is screened of contaminates such as plastics,metals, dirt, and leaves as required by fuel buyers.

In addition to reducing the ever-increasing amounts of woodwaste thatmust be disposed of, recycling woodwaste into high-quality wood fuelshould produce a decreased demand on non-renewable energy sources suchas petrochemical products. The system of the present invention providesan economic and efficient way to tap an energy supply which has in thepast been largely left untouched. It also provides an efficient way forproducing marketable products other than fuel from contaminatedwoodwaste.

In view of the foregoing, it is an object of the present invention toprovide a system capable of producing a less contaminated wood fuel froma wider source of woodwaste.

Another object of the present invention is to provide aneconomically-viable alternative to landfilling woodwastes.

Yet another object of the present invention is to provide high quality,marketable end products from urban woodwaste.

SUMMARY OF THE INVENTION

The present invention is directed to a system for processing wastewood.The system includes an input means for receiving the wastewood and meansfor removing metal from the wastewood. The metal may be removed from thewastewood in one or two stages. If the metal is to be recycled forresale, then, preferably, it is removed in two stages. The systemfurther includes a separation means for receiving the wastewood from themetal removing means and for separating the wastewood according to size.The first size of the wastewood is further processed by the system ofthe present invention and the second size of the wastewood is removedfrom the system. The wastewood of the first size is transferred to atrommel means where it is further separated according to size. Thesystem also includes means for removing plastic and/or paper materialfrom the wastewood.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front, schematic, elevational view of the apparatus of thepresent invention, showing the various stations and components.

FIG. 2 is a flow diagram for the production of usable end products fromwoodwaste, using the apparatus and method of the present invention.

FIG. 3 is a plan view of FIG. 1.

FIG. 4 is an enlarged schematic view of the apparatus of FIG. 1 showingthe metal separation stage.

FIG. 5 is an enlarged schematic view of the apparatus of FIG. 1 showingthe disc screen stage.

FIG. 6 is an enlarged schematic view of the apparatus of FIG. 1 showinga portion of the paper/plastic separation stage and the trommel stage.

FIG. 7 is a view along line 7--7 of FIG. 4.

FIG. 8 is a view along line 8--8 of FIG. 5.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE PRESENTINVENTION

Referring now to the drawings, in which like components in the variousfigures are referred to by the same reference numerals, there is shown apreferred embodiment of the process and apparatus of the presentinvention. FIG. 1 shows the present invention incorporated in a portableapparatus 10 that may travel on roadways. The apparatus 10 is utilizedto convert woodwaste into high-quality end products such as wood fuel,and landscaping and mulching products. FIG. 2 illustrates, for schematicpurposes, the overall process of converting woodwaste into suchhigh-quality end products, which includes the process of this inventionas practiced by apparatus 10.

The process shown in FIG. 2 includes a loading or input step 12 whereinwoodwaste after preferably being subjected to an initial grindingoperation is fed into stage 14 of apparatus 10. Stage 14 includes aconveyer for moving woodwaste along the apparatus and equipment forseparating ferrous metal from the woodwaste. The metal removed from thewood waste, as represented by reference number 16, may be recycled forresale. The woodwaste next moves onto a disc screen, and plastic andpaper separation stage 18. At this stage, plastic and paper are removedfrom the woodwaste, as represented by reference number 20. Additionally,woodwaste in excess of about four inches in length (overs) is removedfrom the process line, as represented by reference number 22. The oversare collected for reprocessing, for example, by the grinder. From stage18, the woodwaste, free of most plastic, paper and metal contaminants,and about one to four inches in length, is transferred by a conveyor 24to a trommel 26. The trommel has two outputs 28 and 30. The number oneoutput 28 consists of woodwaste ranging in size from approximately oneto four inches. This wood waste is suitable for boiler fuel and mulch.The number two output 30 comprises woodwaste, less than an inch, andfines. This product may be used for landscaping and gardening productssuch as compost.

As shown by FIGS. 1 and 3, the apparatus 10 of the present invention ismounted on a towable chassis 32. Thus, it is portable, and appropriatelyconfigured so that it may towed along the nation's highways.Specifically, the overall length and width of the chassis areapproximately 10 and 50 feet, respectively. The height of the apparatusis about 13 feet. The chassis frame is constructed of high tensilesteel, twelve inch structural channel of not less than twenty pounds perfoot. The frame is a fifth wheel design suitable for towing. Thesuspension is tandem axles with leaf springs with a minimum capacity of20,000 pounds each. Air brakes are provided and the tires 34 arepreferably 10 by 22.5 tubeless. The engine 36 is a heavy-duty dieselair-cooled engine having a displacement of 374 cubic inches and a ratedhorsepower of 130 HP with all accessories attached. The engine isequipped with automatic emergency shutdown in case of low oil pressureor high coolant temperature. Also, as is well known in the art, theengine includes an hourmeter, ammeter, oil pressure indicators, anddry-type air filter element with centrifugal precleaner.

The powertrain for the various components of apparatus 10 ishydraulically operated. It is powered by multiple hydraulic pumps,hydraulic motors, sprockets, and chains. Sixteen hydraulic motors areutilized. All hydraulic systems operate well within pressure ratings ofthe hydraulic motors and have adjustable relief valves. All hydraulicsystems incorporate flow adjustment valves for infinite control ofoperating speeds. The specifics of the hydraulic system are notdiscussed in detail since such systems are well known to those skilledin the art and may be suitably designed and constructed by thosefamiliar with the principles of that art.

Referring again to FIG. 1, the feed 12 into the two-stage metalseparation stage 14 may be from a W.H.O. Wood Waste Tub Grinder (notshown) that can process wood and yard waste up to six feet in length and12 inches in diameter at a rate of 10 to 25 tons per hour. This materialis fed from the tub grinder along a conveyor 38. The woodwaste onconveyor 38 ranges in size up to about six inches in any dimension. Atthis point, the woodwaste may also include contaminants such as metals,plastics, paper, and dirt. As will be discussed, subsequent processingin accordance with the present invention removes most, if not all, ofthese contaminants.

Material on conveyor 38 is fed to a conveyor 40 of stage 14. As can bebest seen from FIGS. 1 and 4, endless conveyor 40 is located within asubstantially rectangular-like shell portion 42 of this portion ofapparatus 10 between the side walls 43 thereof. The top of shell portion42 is open and an upwardly-extending input channel or hopper 44 isprovided to facilitate transfer of the material, represented generallyby reference numeral 45, from conveyor 38 to conveyor 40.

Conveyor 40 includes an endless conveyor belt 48 for carrying thewastewood through this stage of apparatus 10. The belt may be formedfrom PVC or rubber. Conveyor belt 48, like the other conveyor beltsutilized in apparatus 10, may be driven by a hydraulic conveyor driveunit. The drive unit may include a variable speed reduction unit so thatthe speed of the conveyor belt is adjustable. The width of conveyor belt48 is about 36 inches. Its normal operating speed is 100 feet per minute(fpm). Conveyor 40, like the other conveyors discussed below, is a flatpan design.

The head roller 46 of conveyor 40 is magnetic, and about 15 inches indiameter. The magnetic head 46 removes ferrous metal from the woodwaste45 on conveyor belt 48. As schematically illustrated in FIGS. 4 and 7,metal 51 on conveyor belt 48 is removed from the woodwaste to drop ontoa conveyor belt 53 of a second conveyor 50, which is disposedperpendicular to the longitudinal axes of chassis 32 and below conveyor40. The woodwaste remaining on conveyor 40 proceeds to the disc screenand plastic/paper separation stage 18, as will be discussed below. Abelt cleaning device 52 is provided to assist in removing metal 51 andany small amounts of wood chips and/or sawdust 55 stuck to conveyor belt48. The belt cleaning device may consist of five plate metal wipers. Thewidth of conveyor belt 53 is about 20 inches and its normal operatingspeed is about 50 fpm. The conveyor belt 53 has a PVC or rubberconstruction. The magnetic head 46 of conveyor 40 will remove nearly allmetal fragments from the woodwaste. Specifically, the woodwaste movingonto stage 18 will contain only about two to five percent of metalfragments. However, small amounts of wood chips and/or sawdust, asnoted, stick to conveyor belt 48 and fall off with the metal fragments,especially during wet weather. As such the metal is too contaminated forresale. Thus, as discussed below, a second metal separation step may beprovided. If it is not desired to recycle the metal for resale, then thesecond metal separation step may be eliminated and the metal, and anysmall amounts of wood and sawdust removed with it may be fed directly toa collection bin (not shown), located at the discharge end of 57 ofconveyor belt 53. Alternatively, this material may simply be dischargedonto the ground.

The secondary metal separation stage provides substantially completeseparation of wood particles 55 from the metal 51. Secondary metalseparation is provided by an overhead crossbelt magnet 60 and a conveyor62 mounted across and above conveyor belt 53. The width of conveyor belt63 is about 20 inches. It has a rubber construction, and normallytravels at a speed of about 50 fpm. The overhead crossbelt magnet 62 isa permanent magnet. The magnet may be about 4 inches high by 16 incheswide by 30 inches long. The magnet is powerful enough to lift metal 51off conveyor belt 53 and hold it on conveyor belt 63, until the metalmoves out of the force field of the magnet at which point it falls offconveyor belt 63 into external metal receiving bin 54. A metal slide 56may extend between conveyor belt 53 and collection bin 54 to ensure thatmetal 51 falls into bin 54. Also as shown, the remaining wood material55 on conveyor belt 53 may be deposited on the ground. This materialnormally consists of small wood chips and sawdust.

As can be seen from FIGS. 4-5 and 8, the woodwaste with most of themetal removed next proceeds to the disc screen and plastic and/or paperseparation stage 18. More specifically, woodwaste 45 moves off conveyor40 onto a slide or sloping metal surface 68, from where it slides ontothe disc screen represented generally by reference number 70. Discscreen 70 is located generally in a rectangular-like portion 71 ofapparatus 10, and is disposed below the side walls 72 of this portion ofthe apparatus, which may be open at the top. (See also FIG. 3).

The screen 70 is approximately 36 inches wide by 13 feet long. It isconstructed of heavy gauge steel to prevent damage or jamming caused bythe material moving through it. The screen comprises 12 rolling shafts74 each having a diameter of about 2 7/16th of an inch. A series ofdiscs or plates 76 are mounted on each shaft across the width of thescreen. Approximately 10-24 discs are mounted on each shaft, and eachdisc is about 10 inches in diameter. These discs may have a star orflower petal shape to facilitate material separation. The shafts aredriven by hydraulic motors through a chain and pulley arrangement. Theyrotate at about 100 revolutions per minute (rpm).

The screen 70 separates the woodwaste material according to size. Thelarger woodwaste material, called overs, about four inches or larger inany dimension, is removed from the process line for reprocessing, forexample, in the grinder. The smaller material, less than about fourinches in dimension, moves onto the final stage in the process. At thisstage 18, plastic or paper contaminants are also removed from thewoodwaste.

Particularly, the smaller material, represented generally by referencenumber 78, falls through screen 70 to be deposited onto a conveyor belt82 of conveyor 80. The width of conveyor belt 82 is approximately 20inches. It operates at a speed of about 200 fpm, and may be constructedof PVC.

The material 78 on conveyor belt 82 exits to the rear of the screen andonto a conveyor belt 25 of a thirteen foot long conveyor 24. From there,as discussed below, it is transferred to trommel 26.

As represented schematically in FIGS. 3 and 5, the larger material,represented generally by reference numeral 75, and plastic and/or papermaterial 77 travel along the upper surfaces of discs 76 of screen 70 tobe discharged onto conveyor belt 86 of overs conveyor 84. As discussed,the plastic and/or paper 77 are separated from the larger woodwastematerial or overs 75. Thereafter, the overs move along conveyor 84 andonto conveyor 35 (See also FIG. 8) to be deposited at an appropriatecollection bin or location from where they may be re-processed in thegrinder for re-introduction into apparatus 10.

Conveyor 84 may have six inch high sides. Its conveyor belt 86 is about20 inches wide and has an open wire mesh configuration to provide forplastic/paper removal as will be discussed. Conveyor 35 is of a similarsize, but its belt is rubber or PVC rather than wire mesh. The dischargeheight of conveyor 35 is adjustable to 12 feet, and it and conveyor 84normally operate at a speed of about 100 fpm.

Pieces of plastic bags and paper mixed in the woodwaste generally willrender the end product unusable as fuel since burning plastics causespollution. Also, the presence of too much plastic and paper in the endproduct will render it useless for applications such as landscaping.Although most plastic and paper may be removed before processing, someusually ends up in the product fed into the grinder. Thus, paper andplastic need to be removed from the woodwaste processed on apparatus 10.The apparatus of the present invention removes at least about 98 percentof all plastic and paper material from the woodwaste.

As best shown by FIGS. 1, 3, 5-6, and 8, the plastics and/or paperseparation components include a cyclone 87, a blower 88, and a vacuumsystem 90. A 4 inch diameter pipe 37 (FIG. 8) extends from blower 88 toa position beneath conveyor belt 86. The end of the pipe opposite theblower is capped and the top surface of the pipe beneath the conveyorbelt has a 1 by 20 inch slot, the width of the slot corresponding to thewidth of conveyor belt 86. The blower provides a charge air flow ofapproximately 1500 fpm through the 1 by 20 inch slot so as to lift paperand/or plastic material 77 from conveyor belt 86 into a hood 92, whichis part of the vacuum system 90. As shown in FIG. 8, hood 92 is locatedabove conveyor belt 86 in the region of the 1 by 20 inch slot.Specifically, the conveyor belt 86 extends through passageways 83 and 85formed by the hood so that a confined space is provided above and belowconveyor belt 86 to facilitate lifting of paper and plastic materialsfrom the conveyor belt. Plastic and paper 77 are forced into the hood bythe pressure generated by blower 88. A window (not shown) may beprovided in the hood so that the lifting operation may be observed.

From hood 92, the paper and/or plastic 77 is drawn through a flexiblevacuum hose 94 by means of a vacuum created by vacuum fan 96. The vacuumfan is preferably a materials-handling fan, which generates a vacuum ofabout 5000 fpm through hose 94, which may have a diameter of about 13inches. The vacuum fan withdraws the paper and plastic material throughthe hose 94 and then forces it through a duct 98, which may be about 12by 14 inches in cross-section. The duct 98 is connected between vacuumfan 96 and cyclone 87. The cyclone is 3 feet in diameter and haspreferably a cone shape. By its swirling action, it separates the airfrom the paper and plastic 77, and collects and then deposits the paperand plastic materials into a collection device, for example, acollection bag 89 located at the bottom of cyclone 87.

As previously noted, the woodwaste 78 is transferred from conveyor 82(below disc screen 70) onto conveyor belt 25 of conveyor 24. Conveyor24, as shown most clearly seen in FIGS. 1 and 5-6, is disposed at anangle from the horizontal to move material 78 from the rear of the discscreen 70 and from below chassis 32 to the inlet port or opening 100 oftrommel 26. Conveyor 24 may have six inch high sides and a width ofabout 20 inches. It can operate at a speed of about 100 fpm, and itsbelt may be rubber or PVC. The trommel 26 includes a cylindrical innerhousing 33 disposed in an outer housing 39. The outer housing may havean open or closed construction. As is known in the art, the innerhousing rotates within the outer housing on wheels (not shown) about itslongitudinal axis at speeds ranging from between 5 and 25 rpms. Theangle of inclination of the trommel may be varied by, for example, ahydraulic jack (not shown). Varying this angle will vary the speed ofthroughput of the trommel. The trommel is about 16 feet long, 13 feethigh and has a diameter of about 6 feet.

A screen or series of screens 102 are formed inside the bottom of innerhousing 33 of the trommel so that during rotation of the trommelsawdust, dirt and wood pieces less than about one inch in size fallthrough screen 102 to be deposited onto conveyor belt 106 of conveyor104, which extends beneath and along the length of the trommel. Conveyor104 transfers these materials onto conveyor belt 110 of conveyor 108.Conveyor 108 conveys the materials to an appropriate collectionlocation. The material (output 30) on conveyor 104 is suitable forvarious uses such as compost and soil amendments.

The larger material, i.e. material one to four inches in size, exits therear of the trommel at outlet port 120. There, it is deposited ontoconveyor belt 114 of conveyor 112 to be transferred to a collectionlocation. This material (output 28) may be used as boiler fuel as wellas mulch from landscaping applications. It contains two percent or lessdirt. Conveyors 104, 108 and 112 are each about 20 inches wide, and maybe operated at a speed of about 200 fpm. They may have rubber or PVCconveyor belts.

This system of the present invention is capable of removing metal,plastic and paper contaminants from shredded woodwaste. It alsoseparates all woodwaste over four inches in dimension from the endproduct. The metal, plastic and paper contaminants, and processed endproduct materials exit the system in five different directions to allowfor adequate product separation. The system can operate at a total flowrate of 25 tons per hour.

As can be seen from the above, the present invention comprises a uniqueapparatus and method for processing woodwaste into usable end productssuch as boiler fuels and landscaping materials. These end products maybe utilized by landscapers, nurseries, sludge composting facilities, andwood fueled power plants. The processed woodwaste is free of allcontaminants, such as ferrous metals, plastic and paper, and isappropriately sized for boiler applications.

The present invention has been described in terms of a preferredembodiment. The invention, however, is not limited to the embodimentdepicted and described. Rather, the scope of the invention is defined bythe appended claims.

What is claimed is:
 1. An apparatus for processing wastewood, thewastewood including metal, plastic or paper material intermixedtherewith, comprising:input means for receiving the wastewood; means forremoving metal from the wastewood; separation means for receiving thewastewood from said metal removing means and for separating thewastewood according to size wherein a first size of wastewood is furtherprocessed by the apparatus and a second size of wastewood and saidplastic or paper material is removed from the apparatus; blower meansfor lifting plastic or paper material from the wastewood and vacuummeans for capturing the plastic or paper material and for transferringit to a collection means; means for transferring said first size ofwastewood away from said separation means; and means for receiving saidfirst size of wastewood from said transferring means and for furtherseparating said first size of wastewood according to size.
 2. Theapparatus of claim 1 wherein said input means includes a first conveyormeans for transferring wastewood from an input feed to said separationmeans.
 3. The apparatus of claim 2 wherein said metal removing meansincludes a magnetic head roller on said first conveyor means forseparating metal from the wastewood.
 4. The apparatus of claim 3 furtherincluding a second conveyor means proximate said first conveyor meansfor receiving and transferring metal separated from the wastewood bysaid magnetic head roller, and a third conveyor means proximate saidsecond conveyor means and having associated therewith a magnetic meansfor removing metal from said second conveyor means, said metal removedthereby transported by said third conveyor means to a collectionlocation.
 5. The apparatus of claim 1 wherein said separation meanscomprises a plurality of rotatable shafts having disc means mountedthereon for supporting the wastewood of said second size and plastic orpaper material wherein the wastewood of said first size falls betweensaid disc means.
 6. The apparatus of claim 5 further including a fourthconveyor means disposed below said disc means such that the wastewood ofsaid first size falls onto said fourth conveyor means.
 7. The apparatusof claim 6 wherein said transferring means includes a fifth conveyormeans for transferring the wastewood of said first size from said fourthconveyor means to said receiving and further separating means.
 8. Theapparatus of claim 7 wherein said fifth conveyor means is inclined at anangle from the horizontal.
 9. The apparatus of claim 7 further includinga sixth conveyor means having a pervious construction for transferringwastewood of said second size and plastic or paper material away from adischarge end of said separation means.
 10. The apparatus of claim 9wherein said blower means removes plastic or paper material from saidsixth conveyor means with wastewood of second size being transferred toa location remote from the apparatus.
 11. The apparatus of claim 10wherein said receiving and further separating means comprises arotatable trommel means having at least two separate outputs.
 12. Theapparatus of claim 11 wherein a seventh conveyor means is disposedsubstantially below and along the length of said trommel means totransfer product discharged at a first one of said outputs away fromsaid trommel means, and an eighth conveyor means is disposed adjacent asecond one of said outputs from transferring product away from saidtrommel means.
 13. The apparatus of claim 1 wherein said collectionmeans includes a cyclone means.
 14. The apparatus of claim 1 whereinsaid vacuum means includes a hood means disposed above said sixthconveyor means and a vacuum fan connected to said hood means toestablish a vacuum.
 15. The apparatus of claim 1 located on a towablechassis.
 16. An apparatus for processing wastewood, the wastewoodincluding metal, plastic or paper intermixed therewith, comprising;inputmeans for receiving the wastewood; means for removing metal from thewastewood; first separation means for receiving the wastewood from saidmetal removing means and for separating the wastewood according to sizewherein a first size of wastewood is further processed by the apparatusand a second size of wastewood is removed from the apparatus, said firstseparation means including a plurality of rotatable shafts having discmeans mounted thereon for supporting the wastewood of said second sizeand plastic or paper material wherein the wastewood of said first sizefalls between said disc means; a first conveyor means disposed belowsaid disc means such that the wastewood of said first size falls ontosaid first conveyor means; means for removing plastic or paper from thewastewood; and a second conveyor means for transferring the wastewood ofsaid first size from said first conveyor means to a second separatingmeans for further separating said first size of wastewood according tosize.
 17. The apparatus of claim 16 wherein said input means includes athird conveyor means for transferring wastewood from an input feed tosaid first separation means.
 18. The apparatus of claim 16 wherein saidmetal removing means includes a first stage for separating the metalfrom the wastewood and a second stage for further separating thewastewood from the metal.
 19. The apparatus of claim 18 wherein saidfirst stage of said metal removing means includes a magnetic head rollerof said third conveyor means for separating metal from the wastewood onsaid third conveyor means.
 20. The apparatus of claim 18 furtherincluding a fourth conveyor means proximate said third conveyor meansfor receiving and transporting metal separated from the wastewood bysaid magnetic head roller.
 21. The apparatus of claim 20 wherein saidsecond stage of said metal removal means include a fifth conveyor meansproximate said fourth conveyor means and having associated therewith amagnetic means for removing metal on said fourth conveyor means, themetal removed by said magnetic means being transported by said fifthconveyor means to a collection location.
 22. The apparatus of claim 16wherein said second separating means comprises a rotatable trommel meanshaving at least two separate outputs.
 23. The apparatus of claim 22wherein a third conveyor means is disposed substantially below and alongthe length of said trommel means to transfer product discharged at afirst one of said outputs away from said trommel means.
 24. Theapparatus of claim 23 further including a fourth conveyor means disposedadjacent a second one of said outputs for transferring product away fromsaid trommel means.
 25. The apparatus of claim 24 further including afifth conveyor means for transferring product from said third conveyormeans to a location remote from said trommel means.
 26. The apparatus ofclaim 16 further including a third conveyor means of perviousconstruction for transferring the wastewood of said second size andplastic or paper away from a discharge end of said first separationmeans.
 27. The apparatus of claim 26 wherein said plastic or paperremoving means removes plastic or paper from said third conveyor meanswherein the wastewood of second size is transferred to a location remotefrom the apparatus.
 28. The apparatus of claim 27 wherein said plasticor paper removing means includes a blower means for lifting plastic orpaper from said third conveyor means and vacuum means for capturing theplastic or paper and transferring it to a collection means.
 29. Theapparatus of claim 28 wherein said vacuum means includes a hood meansdisposed above said first conveyor means and a vacuum fan connected tosaid hood means to establish a vacuum.
 30. The apparatus of claim 28wherein said collection means includes a cyclone.
 31. The apparatus ofclaim 16 located on a towable chassis.
 32. A method for processingwastewood, wherein the wastewood includes plastic or paper materialintermixed therewith, comprising:receiving the wastewood at an input ofan apparatus; separating the wastewood according to size wherein a firstsize of wastewood is further processed by the apparatus and a secondsize of wastewood is removed from the apparatus; removing plastic orpaper material from the wastewood of said second size by lifting ittherefrom and then capturing it by vacuum action to transfer it to acollection means; transferring the wastewood of said second size to alocation remote from the apparatus, and transferring said first size ofwastewood along the apparatus; and further separating said first size ofwastewood according to size and discharging the wastewood so separatedat at least two different outputs.
 33. The method of claim 32 whereinthe wastewood includes metal and the metal is removed from the wastewoodby magnetic means at a first location, the metal then being conveyed toa second location where it is again subjected to a magnetic force, andthe metal then being conveyed to a third location away from theapparatus.
 34. The method of claim 32 wherein said step of furtherseparating includes conveying said first size of wastewood to arotatable trommel means and rotating said trommel means to cause aproduct of a first size to be discharged at a first output of saidtrommel means and a product of a second size at a second output of saidtrommel means.
 35. An apparatus for processing wastewood, the wastewoodincluding metal, plastic or paper intermixed therewith, comprising:inputmeans for receiving the wastewood; screen separation means for receivingthe wastewood from said input means and for separating the wastewoodaccording to size wherein a first size of wastewood is further processedby the apparatus and a second size of wastewood is removed from theapparatus; blower means for lifting plastic or paper from the wastewoodof said second size and vacuum means for capturing the plastic or paperand for transferring it to a collection location; means for transferringsaid first size of wastewood away from said separation means; andtrommel means for receiving said first size of wastewood from saidtransferring means and for further separating said first size ofwastewood according to size.